Insulating layer-forming composition and the use thereof

Abstract

A composition forming an insulating layer is described, whereby a binder based on an alkoxysilane-functionalized polymer carries the alkoxy-functionalized silane group, containing water and an insulation layer-forming additive. The composition according to the invention results in a relatively high expansion rate, enabling coatings to be applied to achieve the layer thickness required for the respective fire resistance duration in a simple and rapid manner, whereby the layer thickness is reduced to a minimum but offers significant insulating effect. The composition according to the invention is particularly suitable for fire protection, especially for the coating of steel components, such as columns, beams, frame members, in order to increase the fire resistance duration.

1 . A two-component system, comprising:
 an insulating layer-forming composition comprising   (A) an alkoxysilane polymer which is terminated and/or has side groups along the polymer chain alkoxysilane groups of the general formula (I)
   —Si(R 1 ) m (OR 2 ) 3-m   (I),
 
 wherein
 R 1  is a linear or branched C 1 -C 16  alkyl radical, 
 R 2  is a linear or branched C 1 -C 6  alkyl radical and 
 m is an integer from 0 to 2, 
 
   (B) 0.1 to 3 wt. % of water with respect to the polymer (A); and   (C) a mixture comprising at least one dehydrogenation catalyst, at least one blowing agent and optionally at least one carbon source and/or at least one thermo-expandable compound,   wherein components (A) and (C) are contained in a first component (I) and component (B) is contained in a second component (II), the first component (I) and the second component (II) are separated from each other to inhibit reaction, and   wherein the alkoxysilane polymer contains at least two alkoxysilane groups and the content of alkoxy groups of the polymer is from 0.20 to 0.85 mmol/g.   
     
     
         2 . The two-component system according to  claim 1 ,
 wherein the polymer comprises a network selected from the group consisting of a polyether, polyester, polyetherester, polyamide, polyurethane, polyester urethane, polyether urethane, polyetherester urethane, polyamide urethane, polyurea, polyamine, polycarbonate, polyvinyl polyacrylate, polyolefin, polyisobutylene, polysulfide, rubber, neoprene, phenol resin, epoxy resin and melamine.   
     
     
         3 . The two-component system according to  claim 1 , wherein the alkoxysilane polymer contains 2 to 8 alkoxy-functional silane groups. 
     
     
         4 . The two-component system of  claim 1 , wherein the insulation-forming additive further comprises an ash crust stabilizer. 
     
     
         5 . The two-component system according to  claim 1 , wherein the composition further contains at least one further ingredient,
 wherein the at least one further ingredient is a material selected from the group consisting of plasticizers, crosslinking agents, water scavengers, inorganic fillers and other additives.   
     
     
         6 . A two-component system according to  claim 1 , wherein component (C) comprises at least one carbon source, at least one blowing agent and at least one dehydrogenation catalyst and these compounds are separated from the other components of the composition in order to inhibit reaction. 
     
     
         7 . The two-component system according to  claim 1 , comprising as component (B) 0.6 to 2 wt. % of water with respect to the polymer (A). 
     
     
         8 . A method of coating a substrate, comprising:
 combining said first component (I) and said second component (II) of said two-component system of  claim 1  to form an insulating layer-forming composition; and   coating said insulating layer-forming composition on a substrate.   
     
     
         9 . The method of  claim 8 , wherein said substrate is a steel construction element. 
     
     
         10 . The method of  claim 8 , wherein said substrate is a non-metallic component. 
     
     
         11 . The method of  claim 8 , wherein said composition serves as a fire protection layer. 
     
     
         12 . A coated substrate obtained by the method of  claim 8 . 
     
     
         13 . A cured object obtained by mixing and curing the two-component system of  claim 1 . 
     
     
         14 . A method of protecting a steel construction element from the effects of heat comprising mixing the two-component system according to  claim 1  and applying to a surface of a steel construction element.